193921121 has 4 divisors (see below), whose sum is σ = 196100100. Its totient is φ = 191742144.

The previous prime is 193921109. The next prime is 193921127. The reversal of 193921121 is 121129391.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11806096 + 182115025 = 3436^2 + 13495^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-193921121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (193921127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1089356 + ... + 1089533.

It is an arithmetic number, because the mean of its divisors is an integer number (49025025).

Almost surely, 2^193921121 is an apocalyptic number.

It is an amenable number.

193921121 is a deficient number, since it is larger than the sum of its proper divisors (2178979).

193921121 is an equidigital number, since it uses as much as digits as its factorization.

193921121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2178978.

The product of its digits is 972, while the sum is 29.

The square root of 193921121 is about 13925.5563982198. The cubic root of 193921121 is about 578.8175682533.

The spelling of 193921121 in words is "one hundred ninety-three million, nine hundred twenty-one thousand, one hundred twenty-one".